#2B4164
Closest named color: Dark Grey Blue (#29465B). oklch(37.4% 0.067 259.4), rgb(43, 65, 100).
Aa
White text reads best on this color (10.27:1).
About this color
#2B4164 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.067 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.025 away. White text reads best on it, at 10.27:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.067) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.04:1 |
| White text | 10.27:1 |
Values
| HEX | #2B4164 |
| RGB | rgb(43, 65, 100) |
| HSL | hsl(217, 40%, 28%) |
| OKLCH | oklch(37.4% 0.067 259.4) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #2B4164 | 10.27:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #2B4164 | 2.04:1 | Fails | Lc 10.2 | Not readable |
| #2B4164 text on white | 10.27:1 | AAA | Lc 93.8 | Preferred for body text |
| #2B4164 text on black | 2.04:1 | Fails | Lc -8.8 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 900.
-
Step 50
50
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CEDAEC
oklch(88.5% 0.028 258.4)
-
Step 300
300
#AEC2E2
oklch(81% 0.05 259.8)
-
Step 400
400
#83A2D3
oklch(70.7% 0.08 259.4)
-
Step 500
500
#648AC7
oklch(63.1% 0.102 259.6)
-
Step 600
600
#4B73B4
oklch(55.6% 0.111 259.7)
-
Step 700
700
#3C609B
oklch(49.1% 0.104 259.8)
-
Step 800
800
#324F7D
oklch(42.8% 0.084 259.3)
-
Step 900
900 (this color)
#2B4164
oklch(37.4% 0.067 259.4)
-
Step 950
950
#1A273B
oklch(27.1% 0.042 258.8)
#2B4164 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #334465 | 0.015 |
| Deuteranopia (no green cones) | #2C3E63 | 0.009 |
| Tritanopia (no blue cones) | #0B494E | 0.059 |
| Achromatopsia (no color) | #414141 | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2B4164
#2B4164
oklch(37.4% 0.067 259.4)
- #543C11
#543C11
oklch(37.4% 0.067 78.3)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #2B4164, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.025
- Charcoal #264653 ΔE 0.038
- Twilight Blue #0A437A ΔE 0.044
- Dark Blue Grey #1F3B4D ΔE 0.046
- Prussian Blue #1D3557 ΔE 0.047
- Marine Blue #01386A ΔE 0.050
- Midnight Green #073B4C ΔE 0.058
- Onyx #343A40 ΔE 0.061
Use #2B4164 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.